function startCourse()
{
        // check to see if cookies is enabled, otherwise, this won't work
        if( typeof sessionStorage == "undefined" || sessionStorage.disabled )
        {
                alert( "You must enable cookies for this course to work properly." );
        }
        else
        {
                // if it is enabled, checked to see if this course was started
                // if it was not able to retrieve, the key "course_started", then
                // then this is the first time we are running the course
	        if( !sessionStorage.getItem( "course_started" ) )
	        {
	                // clear the session storage
	            sessionStorage.clear();
	            // set the "key" by giving it a value.  all values are strings!
	                sessionStorage.setItem( "course_started", "1" );
	                sessionStorage.setItem( "bangladesh", "0" );
	                sessionStorage.setItem( "sudan", "0" );
	                sessionStorage.setItem( "belgium", "0" );
	                sessionStorage.setItem( "finland", "0" );
	                
	        }
        }
}
function visitFinland()
{
        sessionStorage.setItem( "finland", "visited" );
        showQuiz();
} 
        

function visitBelgium()
{
        sessionStorage.setItem( "belgium", "visited" );
        showQuiz();
}

function visitSudan()
{
        sessionStorage.setItem( "sudan", "visited" );
        showQuiz();
}

function visitBangladesh()
{
        sessionStorage.setItem( "bangladesh", "visited" );
        showQuiz();
}


// this function will check to see if every page was visited
// if so, show the quiz link
function showQuiz()
{
	   
        var bangladeshVisited = sessionStorage.getItem( "bangladesh" );
        var sudanVisited = sessionStorage.getItem( "sudan" );
        var belgiumVisited = sessionStorage.getItem( "belgium" );
        var finlandVisited = sessionStorage.getItem( "finland" );
        
        
        
        if( bangladeshVisited == "visited" && sudanVisited == "visited" && belgiumVisited == "visited" && finlandVisited == "visited")
        {
                document.getElementById( "quiz-link" ).style.display = "inline";
        }
       
}

